D21 stalls out when put in drive

[Chapinga]

I've got a 1989 Nissan D21 truck, 2 wheel drive, automatic.  Been running great for a long while and then all of a sudden now when I put it in drive, it stalls. BUT if I have a foot on the accelerator pedal, it will keep running. So raised the idle.  Kinda worked at first but same issue came back within hours.  EFI is computer controlled and seems likely the computer is either working or not so it seems more likely that it's not getting the information it needs from the sensors to balance the fuel mix rather than straight broken, right? I could be wrong...  Often am!

 

Could it be the 02 sensor, TPS or the MAF? Does any of this sound right? Any other ideas? Anyone run up against this issue before?

[datzenmike]

Stalls when cold, warmed up, or anytime?

 

Look for a vacuum leak. A hose off the intake or a cracked hose. If it idles in neutral it should in drive. It may have a small vacuum leak and will run but the added load of being in gear is too much.

 

 

[Chapinga]

Thanks Datzenmike, yeah, it stalls anytime.

If i start it and put it in drive without putting my foot on the accelerator, it stalls.

If I let it idle for 20-30min in park, to warm up, then put it in drive, it still stalls.

No difference.

But...

If i keep a light pressure on the accelerator with one foot it will stay running. That is why I thought it was going to be a simple fix. But doesn't seem to work no matter how high I go with the idle, not having tried unreasonably high speeds I guess, if I let me foot off the gas, it stalls, every time without fail and within 2 seconds. Like near instant.

[datzenmike]

The TPS is a switch to sense idle and full throttle. Put a meter on it and open and close see if the switch is working.

[tr8er]

 

 

[bilzbobaggins]

89 is still a z24 right?

[datzenmike]

VG30i and the last year for the Z24i